Optimizing an indoor lifestyle for cats

Scherk, M. (2016). Optimising an indoor lifestyle for cats. Veterinary Focus, 26(2), 2-9.

• Cats restricted to indoor living have a reduced risk for vehicular trauma, predation,
aggressive interactions with cats and other animals, and exposure to infectious diseases.
• Indoor living is not without risks.
• Not all cats can adapt readily to an indoor lifestyle, and may be at increased risk for
certain behavioral and medical problems.
• All environmental and social needs must be met for successful indoor living, and
the well-being of each cat needs to be evaluated repeatedly over time.
• Predictability, familiarity, routine and having a sense of control are key factors in
reducing stress.
• Offering outdoor access does not compensate if the cat has poor conditions indoors.

Confinement remains the simplest measure to reduce roaming by pet cats

Hall, C. M., Bryant, K. A., Haskard, K., Major, T., Bruce, S., & Calver, M. C. (2016). Factors determining the home ranges of pet cats: A meta-analysis. Biological Conservation, 203, 313-320.

Highlights
• We assessed pet cats' roaming behaviour using meta-analyses and mixed linear models.
• Desexing, regular feeding and interaction with owners did not affect home range.
• Males had larger home ranges than females.
• Both sexes had larger home ranges at low housing densities.
• Confinement remains the simplest measure to reduce roaming by pet cats.

Abstract
Roaming pet cats Felis catus are a significant conservation issue because they may hunt, harass and compete with wildlife; spread disease, interbreed with cats in feral populations, and hybridise with wild native felids. Studies of the roaming behaviour of pet cats are often hampered by modest sample sizes and variability between cats, limiting statistical significance of the findings and their usefulness in recommending measures to discourage roaming. We resolved these difficulties through meta-analyses of 25 studies from 10 countries involving 469 pet cats to assess the influence of sex, whether a cat was desexed and housing density on roaming. A complementary linear mixed models approach used data on 311 individual animals from 22 studies and was also able to assess the influence of age and husbandry practices on roaming. This restricted sample gave greater statistical power than the meta-analyses.

Meta-analyses found that: male pet cats had larger home ranges than females, desexing did not influence home range, and cats had larger home ranges when housing densities were low. The linear mixed models supported those results. They also indicated that animals ≥ 8 years old had smaller home ranges than younger cats. Cats fed regularly, provided with veterinary care and socialised with humans had similar home ranges to cats living in association with households but not provided for in some of these ways. Short of confinement, there is no simple measure owners can adopt to reduce roaming by their cats and prevent the associated environmental problems.

Electronic boundary fence dont impair quality of life of cats

Kasbaoui, N., Cooper, J., Mills, D. S., & Burman, O. (2016). Effects of long-term exposure to an electronic containment system on the behaviour and welfare of domestic cats. PloS one, 11(9), e0162073.
Free-roaming cats are exposed to a variety of risks, including involvement in road traffic accidents. One way of mitigating these risks is to contain cats, for example using an electronic boundary fence system that delivers an electric ‘correction’ via a collar if a cat ignores a warning cue and attempts to cross the boundary. However, concerns have been expressed over the welfare impact of such systems. Our aim was to determine if long-term exposure to an electronic containment system was associated with reduced cat welfare. We compared 46 owned domestic cats: 23 cats that had been contained by an electronic containment system for more than 12 months (AF group); and 23 cats with no containment system that were able to roam more widely (C group). We assessed the cats’ behavioural responses and welfare via four behavioural tests (unfamiliar person test; novel object test; sudden noise test; cognitive bias test) and an owner questionnaire. In the unfamiliar person test, C group lip-licked more than the AF group, whilst the AF group looked at, explored and interacted more with the unfamiliar person than C group. In the novel object test, the AF group looked at and explored the object more than C group. No significant differences were found between AF and C groups for the sudden noise or cognitive bias tests. Regarding the questionnaire, C group owners thought their cats showed more irritable behaviour and AF owners thought that their cats toileted inappropriately more often than C owners. Overall, AF cats were less neophobic than C cats and there was no evidence of significant differences between the populations in general affective state. These findings indicate that an electronic boundary fence with clear pre-warning cues does not impair the long term quality of life of cats.

An international comparison of the attitudes of urban people regarding predation by pet cats

Hall, C. M., Adams, N. A., Bradley, J. S., Bryant, K. A., Davis, A. A., Dickman, C. R., ... & Pollock, K. H. (2016). Community Attitudes and Practices of Urban Residents Regarding Predation by Pet Cats on Wildlife: An International Comparison. PLoS One, 11(4), e0151962.

International differences in practices and attitudes regarding pet cats' interactions with wildlife were assessed by surveying citizens from at least two cities in Australia, New Zealand, the UK, the USA, China and Japan. Predictions tested were: (i) cat owners would agree less than non-cat owners that cats might threaten wildlife, (ii) cat owners value wildlife less than non-cat owners, (iii) cat owners are less accepting of cat legislation/restrictions than non-owners, and (iv) respondents from regions with high endemic biodiversity (Australia, New Zealand, China and the USA state of Hawaii) would be most concerned about pet cats threatening wildlife. Everywhere non-owners were more likely than owners to agree that pet cats killing wildlife were a problem in cities, towns and rural areas.

Cat husbandry practices in different countries. (a) Percentage of households that own one, two or more than two cats (b) Percentage of cats kept in different conditions of confinement (c) Percentage of desexed cats. (d) Percentage of cats that have ever caught vertebrate prey.

Agreement amongst non-owners was highest in Australia (95%) and New Zealand (78%) and lowest in the UK (38%). Irrespective of ownership, over 85% of respondents from all countries except China (65%) valued wildlife in cities, towns and rural areas. Non-owners advocated cat legislation more strongly than owners except in Japan. Australian non-owners were the most supportive (88%), followed by Chinese non-owners (80%) and Japanese owners (79.5%). The UK was least supportive (non-owners 43%, owners 25%). Many Australian (62%), New Zealand (51%) and Chinese owners (42%) agreed that pet cats killing wildlife in cities, towns and rural areas was a problem, while Hawaiian owners were similar to the mainland USA (20%).

Percentage agreement of cat owners (dark blue) and non-owners (light blue) in each country to eight survey items: (a) There is a need for cat legislation (b) All cats should be kept in at night time (c) Cats should be kept on their owner's property at all times (d) It is important to have wildlife in cities, towns and rural areas (e) Pet cats killing wildlife in cities, towns and rural areas is a serious problem (f) Pet cats on farms are harmful to wildlife (g) Pet cats in nature reserves are harmful to wildlife (h) Except for a cat owned by a breeder, all cats should be desexed.

Thus high endemic biodiversity might contribute to attitudes in some, but not all, countries. Husbandry practices varied internationally, with predation highest where fewer cats were confined. Although the risk of wildlife population declines caused by pet cats justifies precautionary action, campaigns based on wildlife protection are unlikely to succeed outside Australia or New Zealand. Restrictions on roaming protect wildlife and benefit cat welfare, so welfare is a better rationale.

Owners attitude towards cat predation on wildlife

MacDonald, E., T. Milfont and M. Gavin, 2015.What drives cat-owner behaviour? First steps towards limiting domestic-cat impacts on native wildlife. Wildlife Research - http://dx.doi.org/10.1071/WR14164
Context: Cats can have substantial negative impacts on native wildlife. To harness the collective conservation impact of owners keeping cats inside, advocacy campaigns need to be based on empirical evidence regarding potential drivers to change cat-owner behaviour.

Aims: We assessed the degree to which different socio-psychological factors (attitudes, subjective norms, and perceived behavioural control), past cat owner behaviour, demographics and group membership explained intentions of zoo visitors to bring cats inside.

Methods: A self-report questionnaire was distributed to zoo visitors based on the theory of planned behaviour. Visitors rated 24 belief statements and four behavioural-intention questions on a scale of one to seven. We adopted an information-theoretic approach to make inferences about the drivers of intention to bring cats inside.

Key results: Attitude and normative beliefs were strong predictors of intention. Specifically, attitudinal beliefs focussed on the benefits to the cat of being inside or the positive impact on the owner were correlated with intention. Bringing cats inside for the benefit of native species was weakly correlated with intention. We found an interaction between normative beliefs (injunctive and descriptive) and past behaviour. For respondents who were intermittently bringing their cat inside, veterinarians were a key injunctive normative influence. In contrast, respondents who kept their cat outside exclusively rated descriptive norms as influential on their own behaviour.

Conclusions: Our results indicated a way forward for future advocacy campaigns. To increase the frequency of visitors bringing cats inside, future research should look at campaigns using veterinarians to advocate messages that emphasise the benefits to the cat of being inside or the positive impact on the owner. To target visitors who keep their cat outside exclusively, a normative campaign highlighting the actions of others bringing their cats inside at night may prove successful.

Implications: Given the impacts cats have on wildlife, conservation campaigns need to properly design communication campaigns to have the best chance at altering cat-owner behaviour. Our results can help guide this process.

Prevalence of parasites in indoor and outdoor cats on St. Kitts

Ketzis, J. K., Shell, L., Chinault, S., Pemberton, C., & Pereira, M. M. (2015). The prevalence of Trichuris spp. infection in indoor and outdoor cats on St. Kitts. The Journal of Infection in Developing Countries, 9(01), 111-113.

Introduction: The present study was conducted to evaluate the prevalence of Trichuris spp. and other intestinal parasitic infections in owned cats on St. Kitts.
Methodology: The feces of 41 non-feral cats (23 indoor only; 18 indoor/outdoor) were examined for the presence of Trichuris spp. eggs.
Results: Nine (22%) of the cats were positive for Trichuris spp. Prevalence of trichuriasis in indoor cats was 26.0% as compared to 16.7% in outdoor cats. Other parasites identified included Ancylostoma spp. (10%; 4 cats), Toxocara cati (2%; 1 cat), Platynosomum spp. (22%; 9 cats), Mammomonogamus spp. (2%; 1 cat) and coccidia (7%; 3 cats).
Conclusion: On St. Kitts, indoor cats are as likely to have parasite infections as outdoor cats. Given the zoonotic potential of some of the identified parasites, periodical anthelmintic treatment should be provided to both indoor and outdoor cats.

A survey of feline leukaemia virus infection of domestic cats from selected areas in Harare

Muchaamba, F., Mutiringindi, T. H., Tivapasi, M. T., Dhliwayo, S., & Matope, G. (2014). A survey of feline leukaemia virus infection of domestic cats from selected areas in Harare, Zimbabwe. Journal of the South African Veterinary Association, 85(1), 6-pages.

A cross-sectional study was conducted to detect the feline leukaemia virus (FeLV) p27 antigen and to determine risk factors and the haematological changes associated with infection in domestic cats in Zimbabwe. Sera were collected for detection of the p27 antigen, urea, creatinine, alanine aminotransferase and gamma-glutamyl transferase levels, whilst whole blood was collected for haematology. FeLV p27 antigen was detected using a rapid enzyme-linked immunosorbent assay (ELISA) test kit. Data on risk factors were analysed using a logistic regression model. Of the 100 cats tested, 41% (95% CI: 31.19% - 50.81%) (41/100) were positive for the FeLV p27 antigen. Sex and health status of cats were not significantly (p > 0.05) associated with infection. Intact cats (OR = 9.73), those living in multicat housing (OR = 5.23) and cats that had access to outdoor life (OR = 35.5) were found to have higher odds of infection compared with neutered cats, those living in single-cat housing, and without access to outdoor life, respectively. Biochemistry and haematology revealed no specific changes. The results showed that FeLV infection was high in sampled cats, providing evidence of active infection. Thus, it would be prudent to introduce specific control measures for FeLV infection in Zimbabwe.

Resolving the urban nest predator paradox: the role of alternative foods for nest predators

Stracey, C. M. (2011). Resolving the urban nest predator paradox: the role of alternative foods for nest predators. Biological Conservation, 144(5), 1545-1552.

Urbanization is a leading cause of species endangerment in the United States; however, certain species thrive in urban habitats. The loss of key predators or the addition of new predators in urban areas could alter the structure of urban communities. A reduction in nest predation is hypothesized to explain the high density of urban birds, yet urban areas typically have increased populations of avian nest predators. The loss of important nest predators in urban habitats, prey switching of urban predators, or successful nest defense against avian nest predators could explain this urban nest predator paradox. To assess these hypotheses I compared nest predation rates of Northern mockingbirds (Mimus polyglottos) in parking lots and residential neighborhoods to populations in pastures and wildlife preserves during 2007–2009 in Florida, USA and placed video cameras on a subset of nests in 2008–2009. Data do not support the hypothesis that urban nest predation rates are consistently lower than non-urban nest predation rates. Of the 56 nest predation events recorded, cats were the dominant urban predator and Cooper’s hawks (Accipiter cooperii) were the dominant non-urban predator. There was no evidence for a loss of important nest predators in urban habitats; however, prey switching by Cooper’s hawks likely occurred. There was also indirect evidence for the importance of nest defense. Furthermore, some of the cats recorded as nest predators in residential neighborhoods were owned cats and all but one cat predation event occurred at night. To reduce nest predation rates, cat owners should keep their cats indoors at night.

Evaluation of outdoor access of owned cats

Clancy, E.A., Moore, A.S., and Bertone, E.R. 2003. Evaluation of cat and owner characteristics and their relationships to outdoor access of owned cats. Journal of the American Veterinary Medical Association. 222(11): 1541–1545.


Objective—To examine characteristics of cats and their owners with regard to outdoor access of owned cats.

Design—Cross-sectional study.

Animals—184 owned cats admitted to a veterinary referral center for nonemergency health concerns.

Results—Cats acquired recently were less likely to be allowed outdoors than those acquired during previous years. Outdoor access was often limited during the day; few owners allowed their cats to remain outdoors at night. Cats acquired from shelters were more likely to be kept exclusively as indoor pets than those cats acquired as strays. The presence of dogs but not other cats in the household was associated with increased outdoor access. Age, health status, and onychectomy status were not significantly associated with outdoor access. Cats allowed outdoor access were more likely to have been bitten by other cats.

Conclusions and Clinical Relevance—The basis for an owner's decision to allow outdoor access appears to be multifactorial, and there may be regional differences in outdoor access of owned cats. Acquisition source is associated with outdoor access of owned cats. Availability of information regarding outdoor access of cats may influence decision making. Educational efforts targeted at specific groups of cat owners, as well as programs that acknowledge owner beliefs regarding quality of life for their cats, may help to address the health, safety, and population concerns associated with outdoor access of owned cats. (J Am Vet Med Assoc2003;222:15417–1545)

ABC: keep cats indoors

Conservation in Florida Keys campaign

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Survey on feral cats and cat colonies in USA

Peterson MN, Hartis B, Rodriguez S, Green M, & Lepczyk CA (2012) Opinions from the Front Lines of Cat Colony Management Conflict. PLoS ONE 7(9): e44616. doi:10.1371/journal.pone.0044616

Outdoor cats represent a global threat to terrestrial vertebrate conservation, but management has been rife with conflict due to differences in views of the problem and appropriate responses to it. To evaluate these differences we conducted a survey of opinions about outdoor cats and their management with two contrasting stakeholder groups, cat colony caretakers (CCCs) and bird conservation professionals (BCPs) across the United States. Group opinions were polarized, for both normative statements (CCCs supported treating feral cats as protected wildlife and using trap neuter and release [TNR] and BCPs supported treating feral cats as pests and using euthanasia) and empirical statements. Opinions also were related to gender, age, and education, with females and older respondents being less likely than their counterparts to support treating feral cats as pests, and females being less likely than males to support euthanasia. Most CCCs held false beliefs about the impacts of feral cats on wildlife and the impacts of TNR (e.g., 20% believed feral cats harmed bird populations, 70% believed TNR eliminates cat colonies, and 18% disagreed with the statement that feral cats filled the role of native predators). Only 6% of CCCs believed feral cats carried diseases. To the extent the beliefs held by CCCs are rooted in lack of knowledge and mistrust, rather than denial of directly observable phenomenon, the conservation community can manage these conflicts more productively by bringing CCCs into the process of defining data collection methods, defining study/management locations, and identifying common goals related to caring for animals.

Cats, birds and you: A brochure from ABC

You can download the pdf here.

When does an alien become a native?

Carthey A.J.R. & P.B. Banks. 2012. When Does an Alien Become a Native Species? A Vulnerable Native Mammal Recognizes and Responds to Its Long-Term Alien Predator. PLoS ONE 7(2): e31804. doi:10.1371/journal.pone.0031804

The impact of alien predators on native prey populations is often attributed to prey naiveté towards a novel threat. Yet evolutionary theory predicts that alien predators cannot remain eternally novel; prey species must either become extinct or learn and adapt to the new threat. As local enemies lose their naiveté and coexistence becomes possible, an introduced species must eventually become ‘native’. But when exactly does an alien become a native species? The dingo (Canis lupus dingo) was introduced to Australia about 4000 years ago, yet its native status remains disputed. To determine whether a vulnerable native mammal (Perameles nasuta) recognizes the close relative of the dingo, the domestic dog (Canis lupus familiaris), we surveyed local residents to determine levels of bandicoot visitation to yards with and without resident dogs. Bandicoots in this area regularly emerge from bushland to forage in residential yards at night, leaving behind tell-tale deep, conical diggings in lawns and garden beds. These diggings were less likely to appear at all, and appeared less frequently and in smaller quantities in yards with dogs than in yards with either resident cats (Felis catus) or no pets. Most dogs were kept indoors at night, meaning that bandicoots were not simply chased out of the yards or killed before they could leave diggings, but rather they recognized the threat posed by dogs and avoided those yards. Native Australian mammals have had thousands of years experience with wild dingoes, which are very closely related to domestic dogs. Our study suggests that these bandicoots may no longer be naïve towards dogs. We argue that the logical criterion for determining native status of a long-term alien species must be once its native enemies are no longer naïve.

Cats killing billions of animals in the US

By Rebecca Morelle
Science reporter, BBC World Service 29 January 2013 

Cats are one of the top threats to US wildlife, killing billions of animals each year, a study suggests. The authors estimate they are responsible for the deaths of between 1.4 and 3.7 billion birds and 6.9-20.7 billion mammals annually.

Writing in Nature Communications, the scientists said stray and feral cats were the worst offenders. However, they added that pet cats also played a role and that owners should do more to reduce their impact.

The authors concluded that more animals are dying at the claws of cats in the United States than in road accidents, collisions with buildings or poisonings. The domestic cat's killer instinct of has been well documented on many islands around the world. Felines accompanying their human companions have gone on to decimate local wildlife, and they have been blamed for the global extinction of 33 species. But their impact on mainland areas has been harder to chart.

To find out more, researchers from the Smithsonian Conservation Biology Institute (SCBI) and the US Fish and Wildlife Service carried out a review of studies that had previously looked at the predatory prowess of cats. Their analysis revealed that the cat killings were much higher than previous studies had suggested: they found that they had killed more than four times as many birds as has been previously estimated.

Birds native to the US, such as the American Robin, were most at risk, and mice, shrews, voles, squirrels and rabbits were the mammals most likely to be killed.

Dr Pete Marra from the SCBI said: "Our study suggests that they are the top threat to US wildlife."

The team said that "un-owned" cats, which they classified as strays, feral cats and farm cats, were killing about three times as many animals as pet cats, but that their owners could do more to limit the impact.

Dr Marra said: "We hope that the large amount of wildlife mortality indicated by our research convinces some cat owners to keep their cats indoors and that it alerts policymakers, wildlife managers and scientists to the large magnitude of wildlife mortality caused by cat predation."

A spokeswoman for the UK's animal welfare charity the RSPCA said that a properly fitted collar and bell could reduce a cat's success when hunting by at least a third.

http://www.bbc.co.uk/news/science-environment-21236690


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Colonias "controladas" de gatos

En un folleto de la American Bird Conservancy, producido dentro de la campaña Cats Indoors, se repasan los problemas asociados a las colonias de gatos "controlados". En ellas, los gatos callejeros se liberan tras su esterilización. En el folleto, firmado por una docena de organismos incluyendo varios colectivos de veterinarios y de activistas por los derechos de los animales, se comentan los problemas asociados a estas colonias. Entre ellos, la depredación que sigue existiendo sobre la vida silvestre, la posible transmisión de enfermedades a las personas y la falta de control sobre las condiciones de vida de los gatos, que siguen padeciendo crueldad o enfermedades. Además, las colonias atraen a gatos abandonados y sirven de "vertedero" de gatos no deseados.
Sin embargo, por ejemplo, el Ayuntamiento de Barcelona reproduce en su web, un documento técnico de trabajo sobre cómo crear y "controlar" una colonia de gatos vagabundos. En el artículo se recomienda contactar con los posibles colaboradores, y luego menciona los aspectos técnicos de la gestión de la colonia. No menciona ni por un momento la palabra "ave" o "depredación".
La información sobre las colonias controladas de gatos es enorme. Alley Cat Allies, por ejemplo, es una organización bien documentada y que tiende a argumentar su postura con criterios. Así, se oponen a los estudios sobre depredación realizada sobre aves y otra fauna silvestre apoyándose en que la extrapolación de los resultados no es realista y que las amenazas sobre las aves son otras. Así, por ejemplo, el artículo sobre el mímido gris que atribuye a los gatos la mayor parte de las bajas conocidas es criticado por extrapolar las causas conocidas de mortalidad al total. Sitios muy activos como Vox Felina, critican intensamente y de forma bastante documentada, los artículos publicados sobre el impacto de los gatos en la biodiversidad. En general, las críticas suelen caer en la ridiculización de los aspectos no tratados por un trabajo o en una caricaturización del método, así como en una demonización de la estadística como herramienta de fabricación de datos a medida. Si bien es cierto que las extrapolaciones son arriesgadas, las críticas simplemente intentan demostrar que la depredación es anecdótica, sin tener en cuenta la enorme cantidad de depredadores domésticos o errantes que constituyen, en su conjunto una presión considerable, si bien no la única, sobre los pequeños vertebrados silvestres. El debate tiene demasiados componentes emocionales (por ambas partes, todo hay que reconocerlo). 

Cats Indoors!

Cats Indoors! The Campaign for Safer Birds and Cats, was initiated by the American Bird Conservancy (ABC) to end the unnecessary suffering and death of birds and other wildlife caused by free-roaming domestic cats. Cats Indoors! seeks to educate cat owners, decision makers and the general public that free-roaming cats pose a significant risk to birds and other wildlife, suffer themselves, and pose a threat to human health.

 

Cats Indoors! encourages cat owners to keep their cats indoors and advocates laws, regulations, and policies to protect cats and birds, including the humane removal of free-roaming cats from areas important to wildlife. The campaign promotes grassroots efforts to address the issue at state and local levels.

Survey on metropolitan domestic cats

Millwood, J. & T. Heaton 1994. The Metropolitan Domestic Cat. Petcare Information and Advisory Service, Melbourne. UAM Conference Proceedings - Canberra 1994

BACKGROUND 

In Australia in recent years, concern has been raised about the possible impact of cats, both domestic and feral, on native fauna populations. 

Concern about the role of domestics cats in particular has led some groups to consider cat management options. 

Management decisions are hampered, however, by a scarcity of scientific information on the interaction of domestic cats with native fauna.

Previous research has shown that domestic cats are catching native wildlife. But - how many? To date, none of the studies published have used sample groups which reflect domestic cat distribution, making it very difficult to draw conclusions about the behaviour of the cat population as a whole. 

Most people live in highly urbanised areas. It was suspected that a survey conducted over the full range of 

metropolitan populations would show that domestic cats in fact catch very few native fauna. 

Petcare Information and Advisory Service (PIAS) thus commissioned Reark Research Pty Ltd, an independent market research organisation, to conduct a detailed survey of the metropolitan cat in all Australian capital cities (except Darwin). The sample group was selected to represent domestic cat distribution within each city, thus ensuring that conclusions could be drawn about the metropolitan cat population. 

The survey was to provide information on the hunting behaviour of domestic cats and determine the size, age and neuter status of the metropolitan cat population. 

OBJECTIVES 

1. To clarify the hunting behaviour of the metropolitan domestic cat, including: 

• What creatures are caught; 
• How many creatures are caught; 
• How many native creatures are caught. 

2. To provide detailed information on the metropolitan cat population, including: 

• what percentage are desexed; 
• changes in cat population over the last 12 months

3. To provide information on factors likely to effect cat hunting behaviour, including: 

• confinement of cats by the owner to the property at night; 
• tendency of cats to roam from the owner's property; 
• wearing bells. 

SURVEY METHODOLOGY 

The survey was designed to provide complete coverage of the cat population within metropolitan Australia, covering the entire Statistical Division for each of the capital cities. 

The metropolitan region included within the scope of the survey covers 62.7 percent of the private dwellings 

throughout the whole of Australia. Within each city, sample selection was controlled to appropriately represent population distribution, and results were weighted accordingly. 

A systematic probability sample of telephone 'white page directory' listings within postcodes classified as 'relatively low' to 'high' population densities was generated. 

Over 4000 households were surveyed. The size of the sample group ensured that the maximum degree of error was limited to not more than + /-2 percent for all estimates relating to the total metropolitan domestic cat population. 

The questionnaire was sequenced to establish a rapport between interviewer and subject, and invite an open and non threatening discussion of the cat's behaviour, thus reducing possible bias due to recent media coverage of 'cat issues'. 

RESULTS 

1. Hunting Behaviour

The proportion of domestic cats which caught prey.

• 41 percent of cats caught introduced mammals such as mice, rats and rabbits (vermin), and 2 percent caught native mammals such as possums or bats. 
• 17 percent of cats caught reptiles or amphibians such as lizards, skunks, snakes or frogs. 
• 19 percent of cats caught introduced birds such as sparrows and starlings, and 7 percent caught native birds such as magpies or honey eaters. 

Overall, 56 percent of cats were reported to catch prey. (Note that as cats could catch more than one type of creature, the total number of cats catching prey is less than the sum of cats catching individual creatures) 

The number of prey caught by domestic cats

Over the period 12 months to April 1994, native species were 33% of metropolitan domestic cats caughts.

2. Domestic cat population

• Almost one million households (985 000), that is 25.2 percent of households throughout the capital cities of Australia own a cat. 
• The total number of cats living within those households is estimated as 1,397,000. 
• Fewer households own cats than a year ago, and the number of cats per cat owning household has also dropped. 
• In the past twelve months there has been a 10 percent decline in the metropolitan cat population. 

3. Factors likely to affect cat hunting behaviour

• 39 percent of the cat population was securely contained at night. 
• 79 percent of the cat population was reported to not roam away from the home surrounds during the day. 
• The proportion of cats which caught any creature was lower for those cats which were confined to the house at night, than those which were allowed out. 
• The proportion of cats which caught any creature was higher for those which wore bell collars than those which did not.

CONCLUSIONS 

The findings support the suspicion that metropolitan domestic cats are in fact catching substantially fewer native fauna than previously supposed. 

During the survey year, each domestic cat is estimated to have caught on average: 

• One fiftieth of a native mammal; 
• One fifth of a native bird; 
• One and a third native reptiles or amphibians; 
• Half of all creatures caught were vermin - mice, rats and rabbits. 

Contrary to common perceptions that cat numbers are increasing, it appears the metropolitan domestic cat population is in decline.

• The metropolitan domestic cat population decreased by 10 percent over April 1993-1994. 
• The vast majority (94 percent) of adult metropolitan domestic cats are desexed. 

Bell collars do not appear to be effective in preventing hunting, although conclusions are difficult to draw as owners are more likely to place bells on cats which are proven hunters. 

Those cats which spend most of their time around the home tend to hunt less.


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100 millions prey in five months in UK!!

Woods, M., R.A. McDonald & S. Harris. 2003. Predation of wildlife by domestic cats Felis catus in Great Britain. Mammal Review 33 (2), 174-188.

1. A questionnaire survey of the numbers of animals brought home by domestic cats Felis catus was conducted between 1 April and 31 August 1997. A total of 14 370 prey items were brought home by 986 cats living in 618 households. Mammals made up 69% of the items, birds 24%, amphibians 4%, reptiles 1%, fish <1%, invertebrates 1% and unidentified items 1%. A minimum of 44 species of wild bird, 20 species of wild mammal, four species of reptile and three species of amphibian were recorded.

2. Of a sample of 696 individual cats, 634 (91%) brought home at least one item and the back-transformed mean number of items brought home was 11.3 (95% CI 10.4–12.2). The back-transformed means and number of cats retrieving at least one item from each prey group were: 8.1 (7.4–8.9) mammals for 547 (79%) cats, 4.1 (3.8–4.5) birds for 506 (73%) cats, 2.6 (2.2–3.0) herpetofauna for 145 (21%) cats and 2.2 (1.8–2.7) other items for 98 (14%) cats. 

3. The number of birds and herpetofauna brought home per cat was significantly lower in households that provided food for birds. The number of bird species brought home was greater in households providing bird food. The number of birds and herpetofauna brought home per cat was negatively related to the age and condition of the cat. The number of mammals brought home per cat was significantly lower when cats were equipped with bells and when they were kept indoors at night. The number of herpetofauna brought home was significantly greater when cats were kept in at night.

4. Based on the proportion of cats bringing home at least one prey item and the backtransformed means, a British population of approximately 9 million cats was estimated to have brought home in the order of 92 (85–100) million prey items in the period of this survey, including 57 (52–63) million mammals, 27 (25–29) million birds and 5 (4–6) million reptiles and amphibians.

5. An experimental approach should be taken to investigate the factors found by this descriptive survey to influence the numbers of prey brought home by cats. In particular, investigation of potential management practices that could reduce the numbers of wild animals killed and brought home by cats will be useful for wildlife conservation, particularly in suburban areas.


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